Why do you find it hard to believe 250 rooms sold out in 10 Min?
In Vegas folks complained that the rooms went too fast (I used a timeshare and avoided that issue). My wife has a gazillion points so we booked Omaha early to avoid the rush, good thing as those rooms were gone in under 30 min (IIRC they accidentally opened it up the day before too). We booked down the street to avoid fighting with the internet for this reason. 250 rooms is nothing for a worldwide reservation system that handles thousands of reservations hourly.